What is cryptocurrency? Explained in plain English
Cryptocurrency is money that lives only on a computer network, with no bank in the middle. Here's how it works, what gives it a price, and what to know before you touch it.
The short answer
A cryptocurrency is a digital asset you can send to anyone online, without a bank or a payment company in the middle.
Instead of a bank keeping the records, thousands of computers keep a shared record of who owns what. That shared record is called a blockchain.
Bitcoin was the first, launched in January 2009. Today there are thousands of others.
How it works, in 4 steps
Here's what happens when you send a coin to someone.
- You sign the payment with a secret code only you hold, called a Private key. Your wallet app does this for you.
- The payment goes out to the network. Computers around the world see it.
- The network checks it. Do you really own the coin? Have you already spent it?
- It's added to the shared record. Once enough checks are stacked on top, it's practically permanent.
No one can reverse it. There's no "dispute this charge" button. That's the big difference from a card payment, and it matters a lot for safety.
Want the details? Our guide on how blockchain works walks through one payment step by step.
Coins, tokens and stablecoins
You'll hear these three words a lot. They're not the same.
| Type | What it is | Examples |
|---|---|---|
| Coin | The built-in money of its own blockchain | Bitcoin (BTC) on Bitcoin, ether (ETH) on Ethereum |
| Token | Built on top of someone else's blockchain | Many project tokens and memecoins run on Ethereum or Solana |
| Stablecoin | A token designed to stay near $1 | USDC, USDT |
A Stablecoin tries to hold a steady price, usually by keeping dollars or short-term US government debt in reserve. In the US, the GENIUS Act, signed on July 18, 2025, created the first federal rules for payment stablecoins.
Everything that isn't bitcoin is often called an Altcoin.
What gives a cryptocurrency its price?
Here's the honest answer. A coin is worth what buyers will pay for it right now.
There's no company profit behind most coins, and no dividend. So the price comes from things like:
- Supply. Bitcoin has a hard cap of 21 million coins. Some coins have no cap at all.
- Demand. How many people want to hold it or use it.
- Use. Some networks charge fees in their own coin, so using the network needs the coin.
- Mood and money flows. News, rules, interest rates and big funds buying or selling.
Because so much of it is mood, prices can swing hard. A move that would be huge for a big company's stock can happen in a day in crypto.
What crypto is used for
People use crypto in a few main ways:
- Holding it as a long-term bet on the network.
- Trading it, buying and selling based on the chart. See crypto trading for beginners.
- Sending money across borders, often with stablecoins.
- Using apps built on blockchains, like lending or swapping tokens. This is called DeFi.
The real risks
Crypto can be exciting. It's also a market where the rules matter more than usual. Know these before you start:
- Big price swings. Coins have fallen by more than 70% from their highs more than once.
- No undo button. Send to the wrong address and the coins are usually gone.
- Scams are common. Fake support agents, "guaranteed" returns, giveaways and fake apps.
- Platform risk. Exchanges have failed or been hacked. FTX collapsed in November 2022.
- Fewer protections. Crypto held at a platform generally isn't covered by SIPC or FDIC the way stocks or bank deposits can be.
- Most new tokens fail. Many coins from past booms are now worth close to nothing.
Rule of thumb: only put in money you could lose entirely without it changing your life. Start small, and learn before you scale up.
Is cryptocurrency legal in the US?
Yes, buying and holding crypto is legal in the US. But the rules are still changing fast.
A few documented facts:
- The IRS treats crypto as property for taxes. Selling, swapping one coin for another, or spending it can all be taxable.
- Spot bitcoin ETFs started trading in January 2024, and spot ether ETFs in July 2024.
- Congress has been debating a broader crypto market law. Check the current status before relying on any rule.
Tax rules are tricky. Talk to a tax professional about your own situation.
How to start, safely
You don't need to buy anything to start learning.
- Watch first. Open a free bitcoin chart on TradingView and watch how it moves for a week.
- Learn to read the chart. Our guide to reading crypto charts covers the basics.
- Practice with fake money. A paper-trading account lets you try ideas with zero risk. See practice trading without money.
- If you buy, buy small. Follow our steps for buying crypto safely.
- Size from your risk. Decide how much you'd accept losing first. The position size calculator does the math.
Try it today: look up bitcoin and ether on a chart. Compare how far each moved last week in percent. You'll see the swings for yourself, with nothing at risk.
Questions
What is cryptocurrency in simple words?
It's digital money that runs on a network of computers instead of a bank. A shared record called a blockchain tracks who owns each coin, and payments can't be reversed once confirmed.
What is the difference between a coin and a token?
A coin is the built-in money of its own blockchain, like bitcoin or ether. A token is built on top of another blockchain, such as the many tokens that run on Ethereum or Solana.
Is cryptocurrency real money?
You can buy, sell and send it, and some places accept it, but it isn't government-issued money in the US. The IRS treats it as property for tax purposes, and its price can swing a lot.
Is crypto safe for beginners?
It carries real risks: big price swings, scams, platform failures and payments you can't undo. Learning first, practicing with fake money, using a checked platform and buying only small amounts you could afford to lose all help.
How many cryptocurrencies are there?
Thousands, and new tokens appear every day. Most are small, many fail, and only a handful are widely used. Bitcoin and ether are the two largest by far.
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